I have some interesting examples that show just how random drops are. All of the examples are
with the career extension coach.
- My 33yo guard dropped OD from 20 to 16 in the first 2 weeks of training last season:

- My 40yo still hasn't dropped in his primary skill:

- My 34yo once had a
triple drop!!!
I always have 33+ year olds with career extension coach, some players dropped 7 skills at the age of 33, some only had 4-6 drops until they turned 36.
Someone I know had a player that had a quadruple drop on OD (from 20 to 16), also with the career extension coach. The player was old, like 38yo or something.